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Weapon mods can be built from raw materials and attached to weapons at weapons workbenches. There are over 700 mods[1], generally including sights, barrels, stocks, receivers, magazines and more. The Gun Nut perk is required to create better modifications for guns. The Science! perk is used to create better modifications for energy weapons and create advanced modifications for bullet based firearms. The Blacksmith perk is used to create better modifications for melee weapons.

Each time a new mod is built, the Sole Survivor receives a small amount of XP.

Building weapon mods replaces the current mod applied to the weapon, the replaced weapon mod is stored in character's inventory. Attempting to craft a weapon mod, which is already present in the character's inventory, will apply the mod from the characters inventory instead of using material (no XP is earned).

Mods stored in a workshop can be reused, and they will be available at all other settlements connected by a supply line. Mods can also be stored in containers.

Every disassembled weapon mod has a weight of 0.5.

Mods purchased from merchants may be reused an unlimited amount of times on as many suitable weapons as one wishes. The breakdown resource value for the weapon will reflect the addition of the mod.

Unlike armor modifications, most weapon mods cannot simply be removed from a weapon except for muzzle modifications. They must be replaced with an available or a newly created modification before the desired mod will be put into the Sole Survivor's inventory. Should the Sole Survivor not have the skill or resources to create the higher tier mods, the mod on an acquired weapon may be replaced with standard mods with fewer resources expended and no skills required.

Each mod may have up to eight qualities describing the magnitude of the mods effect on weapon stats. These qualities are always sorted in descending order in the mods description, ranging from big bonus to big penalty: Exceptional - Superior - Better - Improved - (Standard) - Worse - Reduced - Inferior - Poor